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  1. 3 days ago · Open Safari, and download a macOS disk image (.dmg) file you want via the links on the Apple Support page. Step 2. Double-click the .dmg file you downloaded. It will open a folder with .pkg file. Step 3. Double-click the .pkg file and follow the onscreen instructions to install the macOS installer into your Applications folder.

  2. 2 days ago · Use the USB flash drive to transfer the .DMG file to the iMac (that is still running Yosemite). Open (mount) the .DMG file and run the installer inside to upgrade to El Capitan or Sierra. Now the version of OS X / macOS on your iMac should be new enough that you can use Safari to directly access the "How to download and install macOS" Support ...

  3. 21 hours ago · The first step to creating a bootable USB for Mac is to get the macOS installer of the version you prefer on a healthy Mac. You can get the latest macOS Sequoia in System Settings > General > Software Update and the Mac Apple Store, but you can't find macOS Mojave/Catalina/Big Sur/Monterey in App Store or earlier versions of macOS there.

  4. 2 days ago · This handy program has a built-in free utility called macOS Installer. It can help you download macOS Catalina DMG/ISO file, format USB, and create Catalina bootable installer automatically. Download this software and try this tool for free!

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  5. 2 days ago · Hold down the Command + R keys together as soon as Mac starts or you hear the startup chime. Keep holding down the keys for a few seconds until you see an Apple logo and release the keys to start your Mac in the Recovery partition.

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  7. 2 days ago · Here is a complete tutorial on how to reinstall Mac OS X or macOS Catalina/Big Sur/Monterey on your MacBook Air/Pro/iMac without losing data.

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